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Possible txg locking improvements#4333

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+24-42

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Commits on Feb 17, 2016

• Update tc_count via atomic instruction rather than mutex

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• Do not hold ->tc_open_lock in DMU transactions.

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Commits on Feb 18, 2016

• txg visibility code should not execute under tc_open_lock

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• Revert "Wrap smp_processor_id in kpreempt_[dis|en]able" and "Fix CPU_SEQID use in preemptible context"

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